郑州市人民政府公告

Group 1 - The article discusses a scheduled air raid warning test in Zhengzhou to enhance public awareness of defense and disaster prevention [1] - The test will take place on September 18, from 10:00 AM to 10:31 AM, involving three types of warning signals: pre-warning, air raid warning, and all-clear [1] - Each warning signal has specific durations and patterns, with the pre-warning lasting 36 seconds followed by a 24-second pause, repeated three times, and the air raid warning lasting 6 seconds with a 6-second pause, repeated 15 times [1] Group 2 - The all-clear signal will be a continuous sound for 3 minutes, and the entire test will last for 31 minutes with 5-minute intervals between each warning type [1] - Citizens are advised to maintain normal activities during the test and are encouraged to recognize the warning signals [1]